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j in (-oo:+oo)
30/16 = j/8 // - j/8
30/16-(j/8) = 0
15/8-1/8*j = 0 // - 15/8
-1/8*j = -15/8 // : -1/8
j = -15/8/(-1/8)
j = 15
j = 15
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